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PDF NCP3122 Data sheet ( Hoja de datos )
| Número de pieza | NCP3122 | |
| Descripción | Step-Down DC/DC Switching Regulator | |
| Fabricantes | ON Semiconductor | |
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NCP3122
www.DataSheet4U.com
Dual 2.0 A, Step-Down
DC/DC Switching Regulator
The NCP3122 is a dual buck converter designed for low voltage
applications requiring high efficiency. This device is capable of
producing an output voltage as low as 0.8 V. The NCP3122 provides
dual 2.0 A switching regulators with an adjustable 200 kHz − 2200
kHz switching frequency. The switching frequency is set by an
external resistor. The NCP3122 also incorporates an auto−tracking
and sequencing feature. Protection features include cycle−by−cycle
current limit and undervoltage lockout (UVLO). The NCP3122 comes
in a 32−pin QFN package.
Features
• Input Voltage Range from 4.5 V to 13.2 V
• 12 Vin to 5.0 Vout = 87% Efficiency Min @ 2.0 A
• 200−2200 kHz Operation
• Stable with Low ESR Ceramic Output Capacitor
• 0.8 ±1.5% FB Reference Voltage
• External Soft−Start
• Out of Phase Operation of OUT1 & OUT2
• Auto−Tracking and Sequencing
• Enable/Disable Capability
• Hiccup Overload Protection
• Low Shutdown Power (Iq < 100 mA)
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1 32
QFN32
CASE 488AM
MARKING DIAGRAM
1
NCP3122
AWLYYWWG
G
NCP3122 = Specific Device Code
A = Assembly Location
WL = Wafer Lot
YY = Year
WW = Work Week
G = Pb−Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 41 of this data sheet.
Typical Applications
• Set−Top Boxes, Portable Applications, Networking and
Telecommunications
• DSP/mP/FPGA Core
VIN
R_TRACK
PG1
PG2
Enable
Disable
EN1
Enable
Disable
EN2
R14
R24
C3
GND PG1
PG2
EN1
SEQ1
EN2
SEQ2
TRACK1,2
RVIN
NCP3122
SW1
VIN
SW2
C12
RT C22
R23 R13
L11
D11
GND
C1
GND
L21
D21
GND
C2
GND
OUT1
R11 C11
R12 GND
GND
OUT2
R21 C21
R22 GND
GND
GND
C23 GND
C13
GND
GND
Figure 1. Typical Application Circuit
© Semiconductor Components Industries, LLC, 2008
October, 2008 − Rev. 1
1
Publication Order Number:
NCP3122/D
1 page  
NCP3122
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ELECTRICAL CHARACTERISTICS (−40°C < TJ < 125°C, TJ = 25°C for typical values, VAVIN =12 V, VVIN =12 V, unless otherwise
noted. RT = open kW)
Characteristic
Conditions
Min Typ Max Unit
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range
4.5 13.2 V
SUPPLY CURRENT
Quiescent Supply Current
VEN = H, VFB = 1.0 V
No Switching, PG open
5.0 7.0 mA
Shutdown Supply Current
UNDERVOLTAGE LOCKOUT
VEN = 0 V, PG open
100 mA
UVLO Threshold
UVLO Hysteresis
VIN Rising Edge
VIN Falling Edge
4.3 4.5 V
3.9 4.1
0.15 0.20 0.25 V
SWITCHING REGULATOR
Minimum Duty Cycle
Comp = 0.6 V
0%
Maximum Duty Cycle
Comp = 2.6 V
90
%
High Side MOSFET RDS(on)
High Side Leakage Current
High Side Switch Current Limit Set Point
Current Loop Transient Response
ISW = 0.5 A, TJ = 25°C
VEN = 0V, VSW = 0V
(Note 3)
(Note 4)
250 mW
10 mA
2.6 3.2 3.8 A
100 nsec
FB
VFB Feedback Voltage
OSC
TJ = 25°C
TJ = −40 to 125°C,
4.5 V < VIN < 13.2V
0.788
0.8
0.812
V
0.784 − 0.816
Oscillator Frequency
TJ = 25°C,
TJ = −40 to 125°C
180 200 220 kHz
170 200 230 kHz
TJ = 25°C, TJ = −40 to 125°C
(RT = 12 kW)
Standard Oscillator Frequency Range
TJ = 25°C
TRANSCONDUCTANCE ERROR AMPLIFIER (GM)
1913
200
2200
2530
2200
kHz
kHz
Transconductance
(Note 4)
0.9 1.0 1.1 mS
DC Gain
(Note 4)
50 55 60 dB
Unity Gain Bandwidth
(Note 4)
4.0 MHz
Output Sink Current
Output Source Current
Input Bias Current
Comp Pin Operating Voltage Range
VFB = 1.0 V, Vcomp = 1.5 V
VFB = 0.6 V, Vcomp = 1.5 V
VFB = 0.8 V
(Note 4)
80 100
mA
80 100
mA
100 500 nA
0.6 2.6 V
SOFT−START
Soft−Start Period
Soft−Start Voltage Range
Soft−Start Current Source
VFB < 0.8 V, CS = 0.1 mF
Charging, VSS = 1 V
Discharging, VSS = 1 V
10 ms
0 VFB V
6.0 8.0 12 mA
6.0 8.0 12 mA
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5
5 Page 
NCP3122
TYPICAL OPERATING CHARACTERISTICS
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85
80
75 200 kHz
5V
70
500 kHz
65
750 kHz
60
1400 kHz
55
2200 kHz
50
0 0.5 1.0
1.5
Iout (A)
Figure 25. NCP3122 Efficiency,
Vin = 5 V, Vout = 1.8 V, 255C
90
85 200 kHz
5V
2.0
80
75
70
65
60
0
0.50
500 kHz
750 kHz
1400 kHz
2200 kHz
0.5 1.0 1.5
Iout (A)
Figure 27. NCP3122 Efficiency,
Vin = 5 V, Vout = 3.3 V, 255C
2.0
0.45
0.40
0.35
0.30
0.25
0.20
4
5 6 7 8 9 10 11 12 13
Vin = AVin (V)
Figure 29. RDS(on) vs. Input Voltage
14
90
85
80 200 kHz
12 V
75
70
65 500 kHz
60 750 kHz
55 1400 kHz
50 2200 kHz
45
0 0.5 1.0
1.5
Iout (A)
Figure 26. NCP3122 Efficiency,
Vin = 12 V, Vout = 3.3 V, 255C
95
12 V
90
85
200 kHz
80
75
70 500 kHz
65 750 kHz
60 1400 kHz
55 2200 kHz
50
0 0.5 1.0
1.5
Iout (A)
Figure 28. NCP3122 Efficiency,
Vin = 12 V, Vout = 5 V, 255C
2.5
2.0
2.0
2.0 5.0 Vin
1.5
1.0 4.5 Vin
0.5
0
200 400 600 800 1000 1200 1400 1600 1800 2000 2200
FREQUENCY (kHz)
Figure 30. Maximum Currents vs. Operating
Frequency due to Toff min limitations 3.3 Vout
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| PDF Descargar | [ Datasheet NCP3122.PDF ] | |
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